Enter and Esc keys can now be used to end or cancel Bezier curve drawing

If a selection exists, undo first undos the selection transformation

Canvas is now locked on autoreset and a notification chat message is sent

Layer selection is now restored after session reset

Removed "persistent session" option from the host dialog (this option was misleading since persistence may not be available on the target server. Once a session is started, it can be made persistent via the session settings dialog if the server supports it.)

New features:

Added a built-in tablet testing tool

Added an option to hide the server address in the status bar

Added an option to disable tool toggling shortcut

All admin HTTP queries are now logged

Added a log file for debug messages

Linux specific fixes:

Fixed server build with systemd integration enabled

Qt version in AppImage downgraded to 5.6, as tablet hover events are broken in Qt 5.7 and newer